Syntax Highlighting for Sublime Text 2 with 6502 Assembly.

Asm-6502.YAML-tmLanguage

# [PackageDev] target_format: plist, ext: tmLanguage
---
name: Asm.6502
scopeName: source.6502
fileTypes: [asm, s]
uuid: 86149a15-e3cd-4960-b54c-bc801015f7d4

patterns:
- comment: Preprocessor
  name:    entity.name.function.preprocessor.asm
  match:   ^#.*$

- comment: Directive
  name:    entity.name.function.preprocessor.asm
  match:   \.(asc|dsb|byt|text|data)

- comment: Label
  name:    support.type.asm
  match:   ^(\s*[a-zA-Z][a-zA-Z0-9_]*:)

- comment: Operation
  name:    keyword.mnemonic
  match:   \b(adc|and|asl|bcc|bcs|beq|bit|bmi|bne|bpl|brk|bvc|bvs|clc|cld|cli|clv|cmp|cpx|cpy|dec|dex|dey|eor|inc|inx|iny|jmp|jsr|lda|ldx|ldy|lsr|nop|ora|pha|php|pla|plp|rol|ror|rti|rts|sbc|sec|sed|sei|sta|stx|sty|tax|tay|tsx|txa|txs|tya)\b

- comment: Hexadecimal Literal
  name:    constant.numeric.hexadecimal
  match:   (#?\$[0-9A-Fa-f]+)

- comment: Decimal Literal
  name:    constant.numeric.decimal
  match:   ((\b|#)[0-9]+)

- comment: String Literal
  name:    string.quoted.asm
  begin:   \"
  end:     (([^\\])|(\\\\))\"

- comment: Multi-line Comment
  name:    comment.block
  begin:   \/\*
  end:     \*\/

- comment: Single-line Comment
  name:    comment.line
  match:   ;[^:]+
...